[Chas]

Hmm,

I have a hard copy of Riders Auto radio. I believe it has been scanned online somewhere?

None the less if I can get an exact model number for the radio I will see if both; if I can find that manual and if that model is in it. Then I can scan or pix each page...
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Cars may not have been equipped with a radio at the time of sale ( I had seen these in junk yards with radio block-off plates) and radios could have been recovered from salvage or ordered, installed later. So, that could skew the finding of the correct schematic and model year.

It would likely help me and others if you would sketch the two chassis top sides in blocks and circles locating front, back, tube type/location and any IF coils/transformers on each chassis. If the correct Rider can be found, there may be a usable part list and alignment instructions. I do know setting push buttons was a bit tricky... Clear/sharp photos posted to your thread will help immensely too.

Chas

BTW my wife is at a rest home recovering from heart failure, so I only have an hour every day for hobby stuff...